Antenna



FIG. 1 is a front perspective view of an antenna showing my design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a right-side elevation view thereof;

FIG. 6 is a left-side elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof;

The broken lines shown in the drawings are for the purpose of illustrating portions of the antenna that form no part of the claimed design. 

CLAIM The ornamental design for an antenna, as shown and described. 